<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<input type="text">
<input type="button" value="最后面添加">
<input type="button" value="最前面添加">
<input type="button" value="上海前面">
<input type="button" value="上海后面">
<input type="button" value="删除广州">
<ul>
    <li>北京</li>
    <li>上海</li>
    <li>广州</li>
</ul>
</body>
</html>